This is my minimal approach to a spooler where the filament reel rolls on edge roller bearings. If feeding a 3D printer, it should work smoothly and well.

To note, the spooler arrangement does not work well under high speed, especially with little filament remaining on the spool. The light reel can derail.

You will need four 608 bearings as rollers. the bearing are held in-place in a screwless design. Four 3D printed shafts hold the bearings in-place that push and click into position.

My print is made in Bambu Lab PLA Tough Lavender 1.75mm filament, with 0.2mm layer height and 15% infill on a Bambu X1 Carbon printer with an AMS. Print supports are not required.

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